Shawn Achor’s fascinating book The Happiness Advantage is based on a decade of positive psychology and neuroscience research at Harvard University and Fortune 500 companies. His book reveals that when we are more positive our brains are ‘more engaged, more energised, creative, motivated, healthier, resilient and productive’ – a pretty compelling list! His conclusion is that ninety per cent of one’s happiness is generated from within, not by external factors like fat bank accounts and expensive possessions.